Intermediate (B1)
IPA: /kəmˈpɒstəbl/
KK: /kəmˈpɔstəbl/
Definition
Able to break down naturally and be used as compost, which is a mixture of decayed organic matter used to improve soil.
Example
Many products are now made from compostable materials to help reduce waste.
Conversation

I just bought some compostable bags for my kitchen waste.

That's great! It's good to use products that are better for the environment.

Yeah, I want to reduce my plastic usage as much as possible.

Absolutely! Every little bit helps when it comes to being eco-friendly.
Synonyms & Antonyms
Synonyms
biodegradable
decomposable
organic
Antonyms
nonbiodegradable
synthetic
artificial
Definition
A material that can be broken down into natural compost through the process of decomposition.
Example
Many food scraps and yard waste are compostable and can be added to a compost pile.
Conversation

Have you ever thought about using compostable products?

Yeah, I’ve heard they’re better for the environment.

Exactly! They break down easily and reduce waste.
Root Explanation
Compostable → It is formed from "com-" (meaning together) and "postare" (from Latin, meaning to place). The word refers to materials that can be placed together to decompose naturally into compost.
Memory Tip
Think of materials that can be 'placed together' ('com-') to break down into compost — that's what compostable means.
Visually Confused Words
uncomposable
decomposable
postable
uncomposeable
comfortable
undecomposable
opposable
indecomposable